Go to Micronesia
Micronesia is a group of more than 600 beautiful, tropical, volcanic and forested islands. On the islands you will find a lot of untouched nature with waterfalls and mountains.
Guam Weather in May
May in Guam averages 29°C (84°F) during the day and 27°C (81°F) at night. Quite a bit of rainfall is typical this month, with around 98 mm (3.9 in) on average. An umbrella is a good idea.
Rainfall in Guam in May
You can typically expect 20 days of rain this month, averaging around 98 mm (3.9 in). The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Guam in May
The temperature in Guam in May is excellent. Daytime highs reach 29°C (84°F), with nights dropping to 27°C (81°F). This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 27°C (81°F) overnight, the heat doesn't let up much after dark. If you're staying somewhere without air conditioning, a cold shower before bed and keeping the air moving can help.
Sunshine in Guam in May
Expect a lot of sunshine this month, with about 223 hours of sun. These sunny conditions add to the overall experience.If you're inclined towards comfortable temperatures and drier conditions, May is a good time to visit Guam.
Guam Temperature in May
Min Temperature
27°C (81°F)
Max Temperature
29°C (84°F)
Chance of Rain
65%
Precipitation
98 mm (3.9 in)
Rainy days
20 days
Sunshine
223 hours
Percentage Sunshine
Guam Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Guam - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Guam typically stay consistent throughout May, with daily highs averaging around 29°C (84°F). Nights are warm, with lows around 26°C (79°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Guam in May
Browse day-by-day weather records for Guam spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Guam historical weather extremes in May
Based on 50 years of weather observations in Guam between 1976 and 2026, these are the recorded extremes.
- On May 6, 2002, temperatures climbed to 34°C (93°F), marking the warmest May day on record.
- On May 21, 1976, Guam saw its coldest May day with temperatures maxing out at 26°C (79°F).
- Nighttime temperatures dropped to 22°C (72°F) on May 31, 1985, marking the coldest May night on record.
Best Places in Micronesia in May
Find out more about the weather in Micronesia and which places have the best travel conditions in this month. See all of Micronesia in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Guam in May
Warm weather calls for comfortable, breathable clothing in May. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in Guam in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Guam 3-Day Forecast
More climate data for Guam
See the full Guam climate overview or explore weather in Micronesia.
Popular in May
Where to go in May - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Go to Micronesia
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